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Car Forum / Honda Cars / September 2008How to reset ECU?
I wish to clear the ECU error log (I'm trying to trace an ABS sensor fault) - everything I've read says to pull a fuse or disconnect the battery. I've disconnected the battery overnight(!) but it still remembers the faults. If I can't clear the fault history, I can't see what any new faults are as I do things with the sensors. It's a Honda CR-V 1999 model in the UK, with a 2 pin ECU connector, i.e. pre-OBDII. I have an appropriate reading tool, which gives me the various error codes on the ABS light.  Signaturehttp://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com Mistress: Something between a mister and a mattress. >I wish to clear the ECU error log (I'm trying to trace an ABS sensor >fault) - everything I've read says to pull a fuse or disconnect the [quoted text clipped - 4 lines] >appropriate reading tool, which gives me the various error codes on the ABS >light. I think you need to clear the fault with you diagnostic tool ? Have you fixed the abs fault or traced what the fault is ? >> I wish to clear the ECU error log (I'm trying to trace an ABS sensor >> fault) - everything I've read says to pull a fuse or disconnect the [quoted text clipped - 6 lines] > > I think you need to clear the fault with you diagnostic tool ? The main dealer told me this model needs their computer to reset it, and disconnecting the battery won't do. I don't really believe them as nothing I've read suggests this is required. > Have you fixed the abs fault or traced what the fault is ? I cannot fix the fault without being able to reset the log. I currently have it stuck saying all 4 sensors have been open circuit at one point. I want to see one of them changing to not open circuit when I swap sensors, so I can establish which ones are broken (or more likely the wiring to them - all 4 sensors actually test ok on an oscilloscope). Signaturehttp://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com Archeologists are excited about the discovery of fossils at an excavation in Kenya that indicate man's early ancestors were walking erect over 4 million years ago. They base this conclusion on small traces of Viagra found at the dig site. >> I think you need to clear the fault with you diagnostic tool ? > >The main dealer told me this model needs their computer to reset it, and disconnecting the battery won't do. I don't really believe them as nothing I've read suggests this is required. No, the dealer is right. Some of the third-party scanning tools can reset it as well as the tool the dealer has, though. You really need the right tool. >> Have you fixed the abs fault or traced what the fault is ? > >I cannot fix the fault without being able to reset the log. I currently have it stuck saying all 4 sensors have been open circuit at one point. I want to see one of them changing to not open circuit when I swap sensors, so I can establish which ones are broken (or more likely the wiring to them - all 4 sensors actually test ok on an oscilloscope). If you get the correct scanning tool you should be able to see the sensor data coming across the screen in realtime. This allows you to put the car up, turn the wheels by hand, and look at what is coming into the computer. If all four sensors have been open circuit at some point, look for a place where all four sensor signals are being carried in the same cable harness or the same connector. You'll find the problem there. --scott Signature"C'est un Nagra. C'est suisse, et tres, tres precis." >>> I think you need to clear the fault with you diagnostic tool ? >> [quoted text clipped - 3 lines] > it as well as the tool the dealer has, though. You really need the right > tool. There are not a lot of 3rd party scanners for this car. 99% of those on sale are for OBDII compliant vehicles, which I have missed out on by one year. That's why I bought all three I found - none of them have a reset. All the manuals say to disconnect a fuse or the battery. >>> Have you fixed the abs fault or traced what the fault is ? >> [quoted text clipped - 3 lines] > data coming across the screen in realtime. This allows you to put the car > up, turn the wheels by hand, and look at what is coming into the computer. Any idea where I can get such a scanner? I've looked absolutely everywhere online and phoned several suppliers. > If all four sensors have been open circuit at some point, look for a place > where all four sensor signals are being carried in the same cable harness > or the same connector. You'll find the problem there. Only two were showing open cirucit - the rear two. I removed one rear and one front and took them to an electronics tech to test. He said they were identical which makes me think there is a wiring fault, and put me off taking it to the dealer to fix (as they just wanted to replace both rear sensors costing me £350 for no fix). Since I drove it while he had them for testing, the front right one became open circuit on the log. The front left became open circuit when I removed it to see if the log was being read correctly. I'm now out of good readings! Signaturehttp://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com With the sun beginning to rise, the cabin of the jetliner was suddenly illuminated. "Who turned on the f.cking lights?" a male passenger, who had been surly since boarding, snarled at a stewardess. The girl had had enough of this particular character. "These are the breakfast lights, sir," she answered with forced sweetness. "The f.cking lights are much dimmer, and you snored right through them." How about disconnecting the battery for a minute. By 1999 you should be able to do with the Radio fuse for a minute. I don't know about UK, but in US by 1996 all are OBD-II. Check your engine hood decal. > I wish to clear the ECU error log (I'm trying to trace an ABS sensor fault) - everything I've read says to pull a fuse or disconnect the battery. I've disconnected the battery overnight(!) but it still remembers the faults. If I can't clear the fault history, I can't see what any new faults are as I do things with the sensors. It's a Honda CR-V 1999 model in the UK, with a 2 pin ECU connector, i.e. pre-OBDII. I have an appropriate reading tool, which gives me the various error codes on the ABS light. > > --http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com > > Mistress: Something between a mister and a mattress. > How about disconnecting the battery for a minute. By 1999 you should > be able to do with the Radio fuse for a minute. I don't know about UK, > but in US by 1996 all are OBD-II. Check your engine hood decal. fuse/battery are both "power supply". doesn't mean the ecu has volatile memory though. >> I wish to clear the ECU error log (I'm trying to trace an ABS sensor fault) - everything I've read says to pull a fuse or disconnect the battery. I've disconnected the battery overnight(!) but it still remembers the faults. If I can't clear the fault history, I can't see what any new faults are as I do things with the sensors. �It's a Honda CR-V 1999 model in the UK, with a 2 pin ECU connector, i.e. pre-OBDII. �I have an appropriate reading tool, which gives me the various error codes on the ABS light. >> >> --http://www.petersparrots.com� �http://www.insanevideoclips.com� �http://www.petersphotos.com >> >> Mistress: Something between a mister and a mattress. I've disconnected the battery overnight! In UK it was 2000 we got OBD-II. > How about disconnecting the battery for a minute. By 1999 you should > be able to do with the Radio fuse for a minute. I don't know about UK, [quoted text clipped - 5 lines] >> >> Mistress: Something between a mister and a mattress. Signaturehttp://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com "TWA 2341, for noise abatement turn right 45 Degrees." "Centre, we are at 35,000 feet. How much noise can we make up here?" "Sir, have you ever heard the noise a 747 makes when it hits a 727?" |
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